REVENUES (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 50,632,948	$ 32,470,451	$ 138,918,913	$ 104,153,844
Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	48,260,878	30,499,363	130,095,778	99,372,950
Metals
Disaggregation of Revenue [Line Items]
Revenues	2,372,070	1,971,088	8,823,135	4,780,894
Northern United States
Disaggregation of Revenue [Line Items]
Revenues	12,361,348	7,770,262	31,314,405	22,305,861
Southern United States
Disaggregation of Revenue [Line Items]
Revenues	38,271,600	24,700,189	107,604,508	81,847,983
Black Oil
Disaggregation of Revenue [Line Items]
Revenues	40,400,064	25,358,317	111,106,441	77,546,802
Black Oil | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	40,400,064	25,358,317	111,106,441	77,546,802
Black Oil | Metals
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Black Oil | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	12,361,348	7,770,262	31,314,405	22,305,861
Black Oil | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	28,038,716	17,588,055	79,792,036	55,240,941
Refining & Marketing
Disaggregation of Revenue [Line Items]
Revenues	7,313,630	4,856,520	17,381,741	15,436,919
Refining & Marketing | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	7,313,630	4,856,520	17,381,741	15,436,919
Refining & Marketing | Metals
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Refining & Marketing | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Refining & Marketing | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	7,313,630	4,856,520	17,381,741	15,436,919
Recovery
Disaggregation of Revenue [Line Items]
Revenues	2,919,254	2,255,614	10,430,731	11,170,123
Recovery | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	547,184	284,526	1,607,596	6,389,229
Recovery | Metals
Disaggregation of Revenue [Line Items]
Revenues	2,372,070	1,971,088	8,823,135	4,780,894
Recovery | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Recovery | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	$ 2,919,254	$ 2,255,614	$ 10,430,731	$ 11,170,123